Open focused microwave-assisted sample preparation for rapid total and mercury species determination in environmental...

Area of Science:

• Analytical Chemistry
• Environmental Chemistry
• Materials Science

Background:

• Accurate mercury determination in environmental and biological samples is crucial.
• Traditional sample preparation methods can be time-consuming and may lead to analyte loss.
• Microwave-assisted techniques offer potential for faster and more efficient sample preparation.

Purpose of the Study:

• To develop rapid, simple microwave-assisted leaching/digestion procedures for mercury species analysis.
• To optimize sample preparation for sediment and biomaterial matrices.
• To validate the efficiency and accuracy of the developed methods.

Main Methods:

• Utilized an open focused microwave system for rapid sample preparation.
• Employed HNO(3) solution for methylmercury leaching from sediments.
• Used 25% TMAH solution for biomaterial dissolution and a two-step HNO(3)/H(2)0(2) attack for total mercury recovery.
• Validated procedures using environmental certified reference materials.

Main Results:

• Reduced sample preparation time to 15-24 minutes using microwave-assisted techniques.
• Achieved quantitative leaching of methylmercury without decomposition or evaporation losses.
• Obtained quantitative recoveries of total mercury.
• Demonstrated the effectiveness of the open focused microwave system for solid sample preparation.

Conclusions:

• Open focused microwave-assisted procedures provide rapid and efficient sample preparation for mercury analysis.
• The developed methods are suitable for both mercury species and total mercury determination.
• This technique is a promising tool for analytical and environmental chemistry applications.
• The methods ensure the integrity of methylmercury compounds during sample preparation.